A total of twenty-one exotic mollusc taxa were assessed for Santa Catarina State (SC), fifteen Gastropoda and six Bivalvia (twelve terrestrial, five limnic/ freshwater - three gastropods and two bivalves, and four marine bivalves). Of these, fourteen are confirmed as invasive species (nine terrestrial, three limnic/ freshwater, and two marine).

A total of nineteen continental native mollusc species are confirmed for the Santa Catarina State (SC) (organized in ten Genera and seven Families), one aquatic Prosobranchia/ Caenogastropoda (Ampullariidae), six Pulmonata terrestrial gastropods (one Ellobiidae, three Megalobulimidae and two micro-snails – Charopidae and Streptaxidae) and twelve freshwater mussels (eight Mycetopodidae and four Hyriidae). These species are designated by the International Union for Conservation of the Nature – IUCN as follows: seven as "Vulnerable", six "In Danger" and six “Without Category Established”. The general regional threats that these species are subjected to are briefly analyzed.